Increase maximum aperture by 1 stop.
Increase MTF.
Makes lens 0.71x wider.
Optics designed by Caldwell Photographic in the USA (patent pending).
Electronic integration of aperture diaphragm, controlled by or from the camera body.
Adapter-revolusjon fra Metabones
![](https://naturfilmforeningen.no/wp-content/uploads/2013/01/metabones.jpg)